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Commit a11f63a9 authored by Ulrich Weigand's avatar Ulrich Weigand
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[SystemZ] Add support for 128-bit atomic load/store/cmpxchg 

This adds support for the main 128-bit atomic operations,
using the SystemZ instructions LPQ, STPQ, and CDSG.

Generating these instructions is a bit more complex than usual
since the i128 type is not legal for the back-end.  Therefore,
we have to hook the LowerOperationWrapper and ReplaceNodeResults
TargetLowering callbacks.

llvm-svn: 310094
parent 02f1c02c
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